I've got a FAS6004 which I bought secondhand.
The original owner got a gunsmith to tune it up by following all the instructions at the following link: LINK
I'm no expert at 10m, but it will take a *lot* of practice before I am better than the pistol. It is absolutely laser accurate. I've anchored it on sand bags and it puts pellet after pellet through the same hole. Puts out about 3ft.lbs which is enough to punch very clean holes using 7 grain RWS R10 Match.
I've seen some bad press on forums about the build quality, but I've got zero complaints.